. 1967 riot in Detroit. 43 dead, 467 injured, 7200 arrests, 2000 buildings burned down
2. Companies moved out.
3. Many folks of European heritage moved out.
4. Some folks of African heritage who had enough money moved out too.
5. Along with 2, 3, & 4 went most of the jobs and tax money.
That process, the hollowing out of the cities as those who could move to the suburbs, had started a decade earlier. Highways, cars, and cheap gasoline, along with the single family home on an acre of land as an ideal, made the suburbs possible. The state made home loans cheap, built highways, promoted development and paid for infrastructure like roads, sewers, power lines that supported the vast tracts of single-family homes.
The cities were starved for resources and physically, economically and socially deteriorated. Unemployment, crime, hopelessness and despair were the inevitable outcome. Inner city landlords were burning their properties for the insurance money and to avoid the cost of upkeep.
The riots didn't cause the flight from the city. They may have accelerated the process but the riots themselves were largely a result of unemployment and poor living conditions caused by the hollowing out of the city.
Detroit was one of the first cities to see this trend. It was highly dependent on a few large industries. Was historically a place for poor people from the south to move to. Consolidation of the auto industry and a high proportion of people directly or indirectly dependent on a few large industries made the city more vulnerable to the failure of the tax base.